Reamer



Patented Feb. 6, 1940 UNITED. STATES PATENT OFFICE REAMER poration ofTexas Application December 8,1938, Serial No. 244,523

Claims.

This invention relates to reamers for use in the drilling of wells. Ithas for its general object the'provision of a structure by which areamer cutter of the roller type may be firmly 5 and securely mounted ona reamer body.

In mounting reamer cutters on reamer bodies it is essential that they bemounted as firmly as possible so that there will be no possibility ofplay between any of the parts constituting the in mounting during theoperation of the reamer. It is also essential that the mounting be suchthat it cannot become undone so as to release the cutter eitherpartially or wholly from its mounting during the reaming operation.

1:, It is desirable that such mounting. permit of easy and quickdismounting of the reamer cutters and the remounting of substitutecutters.

It is, therefore, an object of this invention to provide a structure formounting a reamer cutter in a recess in the side of a reamer body insuch a manner as to give the greatest possible degree of rigidity to themounting, prevent any play or lost motion between the parts of themounting during operation, and at the same time utilize the smallestpossible number of parts and eliminate any parts which might easily bebroken or distorted.

It is a further object of this invention to provide a structure whereina reamer cutter may be readily mounted on and dismounted from the reamerbody without necessity for any extraordinary skill or for any unusualtools to accomplish the mounting or removal.

Another object of this invention is to provide a structure which willmake possible the changing of cutters of a reamer in the field withoutnecessity for sending the reamer back to the factory for a. change ofcutters.

Other objects and advantages will become apparent from the followingdescription taken in connection with the accompanying drawing, it beingunderstood that the same are by way of illustration and example only.

In the drawing:

Fig. 1 is a side elevation of a reamer body constructed in accordancewith this invention, showing the reamer cutters in place therein.

Fig. 2 is a vertical cross section through one wall of the reamer bodyillustrated in Fig. 1 and m through one of the cutters mounted therein,the same being taken along the line 2-2 of Fig. 1.

Fig. 3 is a partial horizontal cross section taken along the line 33 ofFig. 2.

Fig. 4 is a partial horizontal cross section taken along the line 4-4 ofFig. 2.

Fig. 5 is a partial horizontal cross section taken along the line 5--5of Fig. 2.

In accordance with this invention, a reamer body l is provided with amajor recess 2 therein adapted to receive a reamer cutter 3, and with ga minor recess at one end thereof and a second minor recess 5 at theopposite end thereof adapted to receive respective supporting blocks 6and l for supporting the reamer cutter. The recesses 1 and 5 both taperin the same direc- 3% tion with respect to the body i. That is, therecess 4 tapers to a smaller dimension in a direction away from themajor recess 2, whereas the auxiliary recess 5 at the opposite end ofthe major recess tapers to a smaller dimension to- 3d ward the majorrecess 2. Both of these auxiliary recesses t and 5 taper toward theouter contour of the reamer body. That is to say, they are each narrowerat the outer contour of the-reamer body than at the bottoms of therespective reit cesses. The blocks 6 and l are correspondingly shapedand tapered so that when either of the blocks 6 or the block l is forceddownwardlyas seen in Fig. 1 it will tend to wedge tightly between thesides of its recess and to be drawn as in toward thecenter of the reamerbody. The tail of the auxiliary recess 5, or that end most remote fromthe major recess is made of greater width than the remainder of thisauxiliary recess as indicated at 8. The lower end of the an auxiliaryrecess 3, or that end most remote from the major recess 2 is widened toprovide an enlarged chamber-like recess 9. Both of the blocks 6 and lare provided with bores extending there through. The bore through theblock 7 is sub- 3g stantially cylindrical and adapted to receive theupper end iii of the shaft on which the cutter 3 is to be rotatablymounted. This shaft is preferably made integral with the block '5 bymeans of welding H or the like. The opening through w the block 8 istapered to a smaller dimension in a direction away from the major recessas shown at l2 and the shaft it is provided with a tapered portion i3adapted to fit this tapered opening in the block 6. A smaller extensionit of the shaft l0 projects into the enlarged recess t and is threadedon its end. A washer i5 surrounds this projecting end M and a nut i6 isthreaded onto the end to hold the washer. Tightening of this nut willobviously draw the block i into tighter wedging engagement with theauxiliary recess 5, will draw the tapered portion 4 3 of the shaft itmore tightly within the block 6, and will draw the block 6 into tighterwedging engagement with the auxiliary recess. a

In assembling the device just described, the body I is first formed asabove set forth, the shaft I is then welded at ll into the block I. Theblock '6 is placed within the recess 4, the cutter 3 is inserted intothe major recess and held in substantially proper position. The block 1is inserted into the minor recess by first placing it within the part 8of this recess and then sliding it longitudinally, guiding the shaft Ill through the central portion of the cutter 3 and through the block 6until the end of the shaft projects into the enlarged recess 9. Thewasher I5 is then put in place over the end of this shaft and the nut l6threaded onto the shaft and tightened. The act of dismounting the cutterfrom the reamer body is the exact reverse of that described.

From the foregoing it will be seen that a means has been set forth forcarrying out all of the objects and advantages sought by this invention,including the provision of a device which is extremely simple and easyto manipulate while at the same time providing for the rigid mounting ofa cutter without any substantial possibility of its becomingaccidentally removed or released.

It is to be noted that the mounting provided makes possible themanufacture of the cutter and mounting parts for the cutter and thetransportation of these parts to the scene where the tool is being used,and the subsequent repairing of the tool by removing the worn cuttersand replacing the said cutters with new cutters.

Having described my invention, I claim:

1. In a reamer construction, a reamer body having a major recess in itsouter surface and a smaller auxiliary recess at each end of said majorrecess, each of said auxiliary recesses tapered toward a smallerdimension in the same direction longitudinally of the reamer body and ina direction outwardly from the center of the said reamer, acorrespondingly tapered block in each of said auxiliary recesses, acutter in said major recess, a shaft secured to one of said blocks andpassing through said cutter and the other of said blocks, and means formoving said shaft longitudinally with respect to said body to cause saidblocks to wedge tightly in their respective auxiliary recesses andsecure said cutter in proper position with respect to said body.

2. In a reamer construction, a reamer body having a major recess in itsouter surface and a smaller auxiliary recess at each end of said majorrecess, each of said auxiliary recesses tapered toward a smallerdimension in the same direction longitudinally of said body and in adirection outwardly from the center of said body, a correspondinglytapered block in each of said auxiliary recesses, a reamer pin havingits ends carried by said blocks, respectively, and extending throughsaid major recess, a reamer cutter rotatably carried by said pin withinsaid major recess, and means for forcing both blocks in the samelongitudinal direction with respect to said body to wedge it tightlywithin said auxiliary recesses.

3. In a reamer construction, a reamer body having a major recess in itsouter surface and a smaller auxiliary recess at each end of said majorrecess, each of said auxiliary recesses tapered in the same longitudinaldirection, and a correspondingly tapered block in each of said auxiliaryrecesses, a reamer pin having its ends carried by said block,respectively, and extending I through said major recess, a cutterrotatably carried by said pin within said major recess, and

means for forcing both blocks tightly into said auxiliary recesses.

4. In a reamer construction, a reamer body having a major recess in itsouter surface and acting therebetween for forcing said blocks tightlyinto said auxiliary recesses.

5. In a reamer construction, a reamer body having a major recess in itsouter surface and a smaller auxiliary recess at each end of said majorrecess, each of said auxiliary recesses being tapered in the samelongitudinal direction with respect to said body, and a correspondinglytapered block in each of said auxiliary recesses, a reamer pin extendingbetween said blocks and through said major recess, a cutter rotatablycarried by said pin within said major recess, and means engaging saidblocks and said body and acting therebetween for forcing both of saidblocks in one longitudinal direction with respect to said body into saidauxiliary recesses.

WILLIAM L. CHILDS.

